The reason why your printout scales to full page is that High Resolution Printing instrument utlimately prints the graph control in full size as you can see looking at the source code for the function.
Changing this behaviour implies some modifications to the instrument code, since FullSize attribute in PrintCtrl must match the same attribute for some other functions in the code (among which some undocumented UIR Functions), so be careful if you want to run the way of modifying it.
If your target is only to obtain a good and nice printout I suggest you to create a wide panel with white background and draw your labels on it with the usual UIR objects (text messages, images, decorations and so on), then print the panel in full size. In my experience a panel 1400*990 pixels wide gives good results on a standard A4 paper even when printing graphic objects (images and graphs): you may want to experiment with different panel and paper sizes depending on your goal.
